Which of these statements is not true? question 20 options: atoms of isotopes of an element have different numbers of protons. atoms of the same elements can have different masses. atoms are mostly empty space. the nucleus of an atom has a positive charge. save?

Atoms of isotopes of an element have different numbers of protons. i took the test

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

the answer is minerals.